Wrote Letter L-343 of 1698-05-09 to the members of the Royal Society about the compound eye of a beetle and the number of facets, the human cornea, drone flies, and gnat brains and leg muscles

May 9, 1698
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Text of the letter in the original Dutch and in English translation from Alle de Brieven. The Collected Letters at the DBNL - De Digitale Bibliotheek voor de Nederlandse Letteren

Leeuwenhoek wrote this letter about the compound eye of a beetle and calculations about the number of facets; observations through the human cornea; the legs, cornea and ommatidia of a drone fly; the brain of a gnat; muscle from the leg of a gnat